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Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Content-Language: en-US To: Chen Wandun , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, guillaume.tucker@collabora.com References: <20220117142712.3967624-1-chenwandun@huawei.com> From: Vlastimil Babka Cc: regressions@lists.linux.dev, Oscar Salvador Subject: Re: [PATCH] Revert "mm/page_isolation: unset migratetype directly for non Buddy page" In-Reply-To: <20220117142712.3967624-1-chenwandun@huawei.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: di5ta66ymrd3wwoo6kgmq3cxr65z8z16 X-Rspam-User: nil Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=BwMmViNl; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=5qugXxX3; spf=pass (imf29.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 54D1F12004F X-HE-Tag: 1643128820-90704 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 1/17/22 15:27, Chen Wandun wrote: > This reverts commit 075782149abff45ee22f27315eced44d02b96779. > > commit 075782149abf ("mm/page_isolation: unset migratetype directly for That's an old -next commit id, it went to mainline as 721fb891ad0b ("mm/page_isolation: unset migratetype directly for non Buddy page") > non Buddy page") will result memory that should in buddy disappear by > mistake. move_freepages_block move all pages in pageblock instead of > pages indicated by input parameter, so if input pages is not in buddy > but other pages in pageblock is in buddy, it will result in page out of > control. > > Reported-by: "kernelci.org bot" > Signed-off-by: Chen Wandun Acked-by: Vlastimil Babka #regzbot ^introduced: 721fb891ad0b There should better be also: Fixes: 721fb891ad0b ("mm/page_isolation: unset migratetype directly for non Buddy page") Especially as that commit had a (inadequate, IMHO, for an optimization) Fixes: tag and could end up being backported somewhere without the followup fix/revert. > --- > mm/page_isolation.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/page_isolation.c b/mm/page_isolation.c > index 6a0ddda6b3c5..f67c4c70f17f 100644 > --- a/mm/page_isolation.c > +++ b/mm/page_isolation.c > @@ -115,7 +115,7 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype) > * onlining - just onlined memory won't immediately be considered for > * allocation. > */ > - if (!isolated_page && PageBuddy(page)) { > + if (!isolated_page) { > nr_pages = move_freepages_block(zone, page, migratetype, NULL); > __mod_zone_freepage_state(zone, nr_pages, migratetype); > }